Wenxi Technology

  Single phase Direct online starter  ( DOL) is a device consist of main contactor, protective devices and overload relay which is used for motor starting operations. It is used for low rating usually below 5HP motors.  direct online starter method of motor starting, the motor stator windings is directly connected to the main supply where the DOL protect the motor circuit from high inrush current which may damage the overall circuit as the initial current is much more higher than the full rated current. Why do we need DOL starter? At startup, the induction motor consumes a significant quantity of current. The motor windings may sustain damage from this beginning current. We employ many methods to lower the beginning current employing Motor Starters (such as star delta or DOL starters) in order to prevent any harm. The motor ratings and the load attached to the motor determine these methods. In addition, the motor starter guards against over-current and overloading. NOTE B...

What is Stator? A stator is the stationary part of an electric motor or generator, consisting of coils or windings mounted on an iron core, designed to create a magnetic field when electric current flows through it. Simply you can say the house of the motor which inside contains Winding slots, bearing, rotor and fan. Learn More Stator Core : In the past, the stator core has changed from solid iron cores to electrical steel laminated sheets, which greatly minimizes energy losses from eddy currents. Carefully packed together, these laminations provide a core that supports the windings and improves the magnetic flux efficiency. Modern stator cores are now more dependable and efficient because to the use of cutting-edge materials and production processes. High-performance electric cars, for instance, depend on these upgraded cores to optimize power production, output, and efficiency . Windings:  The windings, typically made from insulated copper wires or aluminum wires, are crucial for...

               A single-phase induction motor is composed of a single-phase winding located on the  Stator and a cage windings on the rotor. When a single-phase power supply is applied to the stator winding, it generates a pulsating magnetic field. Due to inertia, the rotor remains stationary in this pulsating field.The structure of the single phase induction motor determines that the reverse rotation is generally completed by hardware.   Internal wiring structure of single-phase induction motor           Why there is a capacitor?   1.In the original setup, both the main coil and the auxiliary coil receive power simultaneously, creating equal electromagnetic forces that oppose each other, preventing the rotor from turning.  2 .  To make the magnetic field force rotate, it can be achieved by passing alternating currents of different phase sequencing the main coil and the auxiliary coil. Forwa...

              Two way switch The 2-way switch acts as 2 switches that can control a single lamp. You might ask yourself, why do we need  2 switches for a single appliance when we have one?            The two-way switches are generally used for staircase lightning and other lightning systems where we want to take control of appliances from two different locations.                                                        Suppose you are on the top of stairs and want to turn on the light above the stairs, then using the 2 way switch you can turn on/off the same lamp with two different or locations.               ...

  Voltage V oltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating light .  The term Volt(V) recognizes Italian physicist Alessandro Volta (1745-1827), inventor of the voltaic pile—the forerunner of today's household battery. Voltage is either alternating current (AC) voltage or direct current (DC) voltage.  How can we measure Voltage? Voltage is measured by Voltmeter How to measure voltage in the circuit? Voltage formula  V=I×R                  (Voltage = Current × Resistance ) Example 1; Find the Voltage in the circuit below (Emf) Data given; R=8 I=5 Formula V=I×R V=5×8= 40 V=40 Therefore, E=40 Quiz If an electric circuit is composed of resistance of 0.5 ohms,and 2A (Current) what is the value of Voltage that runs through this circuit? show the answer

  TRANSFORMER     Is the device that transfers electric energy from one alternating current circuit to one or more other circuits, either increasing (stepping up) or reducing (stepping down) the voltage.     Transformers are used to increase or decrease the alternating voltages in electric power applications. PARTS OF TRANSFORMER     There are three parts of Transformer 1.  Primary winding This produced magnetic flux when it is connected to an electrical source. 2.  Secondary winding The flux produced by the primary winding passes through the core will link with the secondary winding. This winding is also on the same core and gives the desired output of the Transformer. 3.  Core The magnetic flux produced by the primary winding passes through this path linked with secondary winding are creates a closed magnetic circuit. TYPES OF TRANSFORMER     According to the design, Transformer can be classified into two categ...

CHANGE OVER SWITCH      Is an electrical switch that switches a load between two sources. The main purpose of this switch is to switch electrical power between two sources without any fault easily, manually, or automatically.     THERE ARE TWO TYPES OF CHANGE OVER SWITCH  Automatic change over switch Manual change over switch What is automatic change over switch? Is an electrical switch that switches to the other power source automatically once the main source stops providing power. What is a manual change over switch? Is an electrical switch that is used to switch to the other power source manually.  Change over switches are categorized as follows   2 Poles (N and L)  3 Poles (L1, L2, and L3) 4 Poles (L1, L2, L3, and N) PRECAUTION MEASURE BEFORE THE INSTALLATION   Disconnect the power source before servicing, repairing or installing electrical equipments. Use the proper cable in size. Never try to work on electricity without p...

A rectifier diode is  a two lead semiconductor that allows current to pass in only one direction. How to make a bridge rectifier? 

This simple project is about building a circuit that will be controlled by the light whether to switch ON or OFF the next circuits. The Diagram  LDR Project

Electrical charge (Q) Electromotive Force (emf) The voltage drop across the load(Vd) Ampere(A) Resistance(R) 1:Electrical charge (Q)         Electric charge is a physical property of matter which causes objects to experience a force when it is placed in an electric field When current flows, electrical work  is done and energy is transferred. The amount of charge passing a point in the circuit can be calculated using the equation: charge = current × time Q = I × t Example A current of 2 amps (A) flows through a simple electrical circuit. How many coulombs of charge will flow in 30 seconds? Q=I×t  Q=2×30 Q=60C Where I= Current(A) and t=  time 2:Electromotive Force (emf)          Electromotive Force is the amount of energy delivered per unit of electric charge by a power source such as a generator or a battery (abbreviated E or EMF) Emf equation ε=E/Q Where  ε= electromotive force, E=energy(Watt), and Q=Coulombs 3:Voltage dro...

  How electricity formed? By the force or pressure that pushes or forces electrons to move through the conductor in one direction. Source of electricity Friction Chemical  reaction Magnetism Heat Light Mechanical pressure  How above sources of electricity works? 1.Friction When certain materials are rubbed against each other, for instance, silk and glass rod or when you comb your hair (plastic and human hair). The atoms of both materials lose or gain an electron hence one of the two materials becomes positively charged and the other negatively charged. 2.Chemical  reaction  When two pieces of none similar metals are immersed into a chemical solution, the chemical process known as electrolysis will take place between metals and solution. This will cause one metal to lose an electron and the other to gain and hence pressure of force will be created between the two terminals of metals act as a source of electricity (The device called Cells or battery) 3.Heat This h...

Circuit breaker A circuit breaker is a switching device that interrupts the abnormal or faults current. When does the circuit breaker trip? Exceeded current is flowing through the circuit. The live and neutral wires are contacted (due to an overheated/melted component). A power line has ruptured, perhaps by driving a nail in the wall.

The control circuit to control DC motors F&R Independently.   What is this circuit for? Controlling the Electric car F&R right & left. Controlling the winch, up and down, left and right. Locking and unlocking the door . Here's the circuit

What's Next? Handling workshop tools

Safety At the end of this lesson, you should be able to; Define Safety Mention and Explain Safety Explain the word "Sign" Interprete signs Explain the importance of using safety gear Explain the personal safety habits Safety Is the situation of being safe from dangerous or harmful. Safety gear is any equipment or tool which helps the person for protection against injury . Sign A n object, quality, or event whose presence or occurrence indicates the probable presence or occurrence of something else. or i s a symbol that shows a particular objec t.    The importance of using safety gear It avoids death Protect health It saves life Encourage people safety It reduces accidents  The following are personal safety habits  Wearing Safety gear. Report any kind of damage to equipment. Care must be taken. Use the proper tools or equipment. Access the hazards before start working.        ...

Lighting circuit This is the circuit a user use to switch ON or OFF the lighting circuit. How to Install lighting circuit? Before we start, Let us see what kind of tools and equipment are mastery.   * Wear safety gear before you start. The board 1.5 mm² cable One way switch PC 1 Electrical tape Screw driver combination pliers    Scissor pliers Bulb Wiring Diagram  Tools and equipment usage   Is where you circuit lays Transferring  power(wiring) Switching ON/OFF Confining the connections   For screwing screws  Cutting cable /  Removing insulator Testing your circuit 

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